ChemDraw alternative: structure editors and chemistry figure tools

What ChemDraw does that a figure tool cannot

ChemDraw is a chemistry drawing application first. Revvity Signals documents stereochemistry indicators that update as you draw, structure and reaction clean-up, conversion between names and structures, and 1H and 13C NMR prediction in its higher tiers. Those features depend on the software understanding the molecule. SciFigure AI generates images, so it cannot validate valences, assign stereocenters, or produce a structure file. For anything a reviewer will check atom by atom, use a structure editor.

Free and paid ChemDraw alternatives for structures

• Ketcher (EPAM): an open-source web editor for small molecules, biomolecules, and reactions under the Apache License 2.0. It is the strongest free ChemDraw alternative if you want to work in a browser.
• MarvinSketch (Chemaxon, now part of Certara): a fully featured desktop chemical drawing tool. Licensing is not listed publicly; Marvin Cloud offers a 14-day trial and academic plans, so check the official page.
• ChemDoodle 2D (iChemLabs): paid, at $29 per month, $199 per year, or $999 for a lifetime license, on Windows, macOS, and Linux.
• Avogadro: a free, open-source (BSD 3-clause) 3D molecular editor and visualizer for Windows, Linux, and macOS, useful when you need 3D models rather than 2D drawings.
• ACD/ChemSketch Freeware: ACD/Labs, now part of Revvity Signals, lists the freeware as discontinued, so it is no longer an option for new users.

Picking a ChemDraw alternative for Mac

On a Mac, the options we verified are Ketcher, which runs in a web browser; ChemDoodle 2D, which ships a native macOS build for Intel and Apple Silicon; and Avogadro for 3D models. SciFigure AI also runs in the browser, so the figure side of the work is the same on macOS, Windows, and Linux.

Where SciFigure AI fits in chemistry work

Many chemistry papers need more than structures: a table of contents graphic, a graphical abstract, an overview of a catalytic cycle, a schematic of a material or device, and plots of the data. SciFigure AI drafts those figures from a text description or sketch, and its chart generators turn CSV or Excel data into publication-ready PNG charts. AI illustration requires a paid purchase; charts can use free credits.

• TOC graphics and graphical abstracts built around one central result.
• Mechanism overview illustrations for introductions and reviews, not formal arrow pushing.
• Materials, catalysis, and device schematics.
• Data charts such as dose-response curves, scatter plots, and heatmaps.

Recommended workflow: structures first, figure second

• Draw each structure in a structure editor such as Ketcher, ChemDoodle, or ChemDraw, and check it there.
• Export the structures as images from that editor.
• Describe the overall figure in the TOC Graphics Generator, Graphical Abstract Maker, or Chemistry Diagram Generator, or start from a sketch in AI Drawing.
• Use Editable Export to get SVG or PPTX with editable text, arrow, label, and callout layers, then place your validated structures over the figure image.
• Replace or remove any structure the AI drew, because generated structures are illustrations, not checked chemistry.